Bently Nevada 2789-096 Extension Cable Product Specification
2789-096 is factory pre-calibrated matched coaxial extension cable exclusively developed for Bently Nevada eddy current proximity transducer system. It connects the factory molded integral pigtail of proximity probe and corresponding proximitor to build a complete closed measurement circuit conforming to API 670 turbomachinery protection standard. Widely used in power, petrochemical and metallurgical industries for TSI monitoring of steam turbines, turbo-generators, centrifugal compressors and large industrial blowers, the cable transmits clearance-variable analog voltage signals to proximitor and subsequent 3500 rack monitor modules for real-time radial vibration, axial thrust displacement and Keyphasor pulse measurement, together with equipment fault alarm and safety interlock protection. Each finished cable is subjected to continuity testing, impedance matching calibration, insulation resistance inspection and high-low temperature cyclic aging test before factory delivery to maintain steady signal transmission under harsh on-site conditions including high ambient temperature, dense lubricant oil mist and complicated electromagnetic interference inside bearing housings and control cabinets.
Description
Bently Nevada 2789-096 Extension Cable Product Specification
1. Product Overview
2789-096 is factory pre-calibrated matched coaxial extension cable exclusively developed for Bently Nevada eddy current proximity transducer system. It connects the factory molded integral pigtail of proximity probe and corresponding proximitor to build a complete closed measurement circuit conforming to API 670 turbomachinery protection standard. Widely used in power, petrochemical and metallurgical industries for TSI monitoring of steam turbines, turbo-generators, centrifugal compressors and large industrial blowers, the cable transmits clearance-variable analog voltage signals to proximitor and subsequent 3500 rack monitor modules for real-time radial vibration, axial thrust displacement and Keyphasor pulse measurement, together with equipment fault alarm and safety interlock protection. Each finished cable is subjected to continuity testing, impedance matching calibration, insulation resistance inspection and high-low temperature cyclic aging test before factory delivery to maintain steady signal transmission under harsh on-site conditions including high ambient temperature, dense lubricant oil mist and complicated electromagnetic interference inside bearing housings and control cabinets.
2. Part Number Definition
2789 stands for the base product series of standard calibrated extension coaxial cable for Bently eddy current probe system; suffix 096 specifies fixed factory-calibrated overall length, dual-end connector type, internal coaxial layout and outer sheath configuration. This model is configured for specific matched proximity probes and proximitors at factory; random replacement with unmatched non-original cables will invalidate the whole measuring loop’s original calibration data and lead to measurement error.
3. Core Functional Features
Designed with double-layer full shielded coaxial inner structure, the cable effectively suppresses external electromagnetic interference and high-frequency signal attenuation during signal transmission, preserving linearity performance of the complete transducer system. High temperature and oil resistant outer sheath protects inner insulation and conductive core against mechanical scratch, extrusion deformation and long-term lubricant corrosion inside equipment cabins. Standard gold-plated coaxial connectors are pre-installed on both cable ends for accurate positioning and tight locked connection with probe tail plug and proximitor socket, minimizing intermittent signal failure caused by poor terminal contact. The fixed total length is precisely calibrated in production to keep original factory sensitivity and effective linear measurement range of matched proximity sensor set.
4. Electrical Specifications
Compatible with standard Bently proximitor negative DC power supply from -17.5VDC to -26VDC. Characteristic impedance and distributed capacitance are strictly calibrated to match paired proximity probe parameters and reduce high-frequency signal reflection loss. High-performance inner insulating material guarantees superior insulation resistance to prevent signal drift induced by moisture penetration or oil soaking into cable core. Only designated original matching probes and proximitors can be assembled with this cable to retain factory-calibrated measurement accuracy.
5. Environmental Working Parameters
Continuous allowable operating temperature of cable body ranges from -40°C to +177°C, suitable for high-temperature routing near bearing pedestals and normal wiring inside control cabinets. Spare part storage temperature is between -55°C and +95°C under non-condensing storage environment; applicable working relative humidity covers 5%RH~95%RH with surface condensation strictly forbidden to avoid insulation degradation and internal short circuit risk. The cable can withstand regular industrial vibration of 10Hz~2kHz generated by running rotating equipment; long-term continuous exposure to strong corrosive gas and persistent hot steam immersion is prohibited to extend service life of inner insulation and conductors. Shorten regular inspection cycle appropriately for installation above 1000 meters altitude.
6. Installation and Routine Maintenance Guidance
During field wiring, separate cable layout from high-voltage power cables and frequency conversion equipment to avoid cross electromagnetic interference, and reserve appropriate cable slack to accommodate thermal expansion and equipment vibration instead of overstretching cable body. Align connector positioning notches completely before tightening lock nuts to achieve full connector engagement. In periodic maintenance, regularly inspect outer sheath integrity and connector fastening tightness to eliminate hidden risks of intermittent signal loss from sheath aging or loose terminals. When field replacement is needed, only spare cable with identical part number 2789-096 can be directly installed. All replacement cables complete full factory electrical calibration and aging test before delivery to ensure full interchangeability during equipment overhaul.
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